Simple compound interest

Simple compound interestSecondary school education and math learning point ( simple and Compound interest)

1) annual purchase 5.00 rate of interest How many time of interest 300 tk.  সমand 300  profits 405 tk.

Example : interest =interest and profits -p  ,so interest = ( 405-300) = 105 tk
100 tk 5 interest 1 year.
1     "  1   "   "  1×100/5
300 "  105   "  1×100×105/5×300 =7 year .
Answer: 7 year.
2) 6,666 annual 10% interest How many will be 23332 tk?
Example: interest = interest p  - profits
 so= (13332-6666) = 6666 tk
10% interest , 100 tk 1 year interest 10 tk
1   "   "  1  " 10/100
6666"    1  "  10×6666/100 = 666.6 tk
Answer: 666.6 tk.
3) 8,888 annual 10% interest How many years Will be interest and profits 17,776 tk?
Example: interest= ip  - p so interest = (17,776-8888) = 8888 টাকা
10% 100 tk 1 year of interest 10 tk.
1   "   1   "   10/100
8888 "  1  "  10×8888/100 = বা 888.8 টাকা
নির্ণয়ে সময় 8888/888.8 = 10 বছর
Answer: 10 years.
4) annual 8% rate of interest How many years Will be interest and profits? 
Example: p 100 tk  interest  100 tk.
Time = 100/8 year = 12 .5
Answer: 12.5
5) annual 5 rate of interest.how many years Will be interest more than profits? 
Example: p 100 tk it will be interest and profits (100×2) = 200 tk.
Interest = (200-100) = 100 tk.
Time 100/10 years = 10 years
Answer:10 year.
6) annual 10 tk rate of interest.how many years Will be profits more than interest? 
Example: profits 100 tk it will be interest and profits =(100×3)= 300 tk.
Interest= (300-100)= 200 tk.
Time = 200/10 yeari= 20 year.
Answer:20 year.

                            

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Compound interest secondary education Math suggestions

Compound interest

Secondary school education and math learning point ( simple and Compound interest)

 Simple and compound interest
 Every year invest of money that get a extra money it's meaning to the interest.

principal/capital/sum
That keeps to deposit or browed money has invested of bussines it's meaning principal money (Amount)
Interest and principal money . actually said principal money with  added it mean principal money. Okay? 
Interest-pricipal money= principal money+interest.
Rate of interest
Depending of any fixed deposit and for fix time. That gives money it mean said rate of  interest notable 100 tk interest of 1 year it's meaning rate of interest. It said that annual or purchased rate of interest . annual interest rate such as rate 4% or 4 tk in has published on the report.
Classification of interest
*Simply interest
*Compound or circle inty
simple interest
Simply interest give for interest every year .but it didn't added with simple interest so it remains to same. 
*Interest (I)=principal money(P)×time(n)×rate of interest (r)
*Meaning(I)=Pnr
*Interest and principal money (A)=principal money(P)+interest(I)
*Meaning A=P+I বা , A=P+Pnr or, A=P(1+nr)
       Interest.
1/ 100 tk  interest of 1 year 5 tk . 200 tk  How much of interest 2 year's?
Example :100 tk 1 year interest 5 tk.
1     "   1  "     "  5/100
200 "   2  "     " 5×200×2/100
Or, 20 tk.
2/annual rate of interest 10.50 tk 2000 tk  how will be  interests of 5 year.?
Example : 100 tk 1  year of interest 10.50 tk.
1     "    1  "    " 10.50/100
200 "    5  "    " 10.50×5×2000/100
Or, 1050 tk.
3/ annual 5% rate 750 How will be interest of 4 year's?
Example: There principal money P = 750 tk. Time  n= 4 years r= year 5%  interest= I ?
I= Pnr = (750×4×5/100)= 150 tk.

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Profits Math formula

Profits math formulaSecondary school education and math learning point ( losses-profits)

1/  buy a object its meaning valued the object.
2/buy more than sell valued .
3/ profits = buy - profits
4/ loss  =buy - sell
5/buy = (buy - profits) or ( buy +loss).
6/  buy = ( buy + profits) or ( buy - losd)
7/ interest of purchase = profits×100/ buy
8/ loss of purchase = losd × 100/buy
9/ invest = buy + cost
10/ Ned p=br;
There p = Ned profits , b = invest ,r= rate of interest
11/ interest and principal money = interest + principal money.
12/ rate of purchase = interest× 100/Time×principal money
13/ interest = p × r × time/100
14/ principal money = i × r / rate of interest × time
                **Invest and profits formulation**
X% rate of simple interest p rate of money  n for year
1/ I = pnr tk. There  I = simple interest
     P= principal money n = time
2/
S = p+1  = p+pnr=p(1+nr)
                           **Circle interest**
X% rate of circle interest  p tk invested n = year.
Principal money c = p(1+r)n
Circle interest  I = (C-P)
C= circle interest
r = rate of interest.

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